Machinery for treating molding-sand.



No. 661,256. Patented Nov. 6, I900.

J. A. BOUGHTON. MACHINERY FOR TREATING MOLDING SAND.

(Application filed May 22, 1899.)

3 Sheats-Sheat I.

(No Model.)

No. 66|,25fi. .Patented'Nov. 6, I900.

' J. A. BUUGHTUN.

MACHINERY FOR TREATING MOLDING SANDQ (Application filed May 22. 1899.)

(No Model.)

3 Sheets-"Sheet 2.

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A lication filed May 22, 1899.)

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THE NORRIS wzrzns cc PHOYD-LITHOY, WASHINGTON, u c. 6

JOHN A. BOUGHTON, OF EVERETT, OHIO.

MACHINERY FOR TREATING MOLDING-SAND.

SPECIFICATION forming part of Letters Patent No. 661,256, dated November 6, 19 00.

Application filed May 22,1899. 591ml 717,769. (No model.)

To aZZ whom, it 72m concern:

Be it known that I, JOHN A. BOUGHTON, a citizen of the United States, residing at Everett, in the county of Summit and State of Ohio, have invented a new and useful Apparatus for Treating Molding-Sand, of which the following is a specification.

My machinery relates to the preparation of sand for molders use, the object being to provide improved machinery for such purpose, whereby ordinary sand will be freed from vegetable matter, clay, loam, and all other foreign substances and delivered in regular and uniform grades in quality and firmness to molders for use in preparing molds for casting metal.

With this object in view my invention consists in the improved machinery hereinafter fully described and afterward specifically pointed out in the appended claims.

In order to enable others skilled in the art to which my invention most nearly appertains to make and use my machinery, I will now proceed to describe the same, having reference to the accompanying drawings, in Which- Figure 1 is a perspective view of the outside of a building in which my invention is carried out, some of the inclosed machinery being indicated in dotted lines. Fig. 2 is avertical sectional view on the dotted lines 2 2 of Fig. 3. Fig. 3 is a vertical sectional view on a plane at right angles to that of Fig. 2, as indicated by the dotted lines 3 3 of Fig. 2. Fig. 4 is a vertical sectional view on a plane parallel with that of Fig. 3, as indicated by the dotted lines 4 4 of Fig. 2. Fig. 5 is a detail sectional view on the plane indicated by the dotted lines 5 5 of Fig. 4. Fig. 6 is a view in end elevation of a sand-sieve and knocker in position over the feed-hopper. Fig. 7 is a view of the same in side elevation with the side removed. Fig. 8 is a top plan View thereof, and Fig. 9 is a sectional view on the broken line 9 9 of Fig. 8.

Like numerals of reference'mark the same parts wherever they occur in the various figures of the drawings.

The building in which is located the machinery for carrying out my invention consists, essentially, of an engine and furnace shed 6, a central structure 7 communicating therewith, the upper portion of which contains two bins 8 9 and an elevator-way 10, and two store rooms or houses 11 and 12 on opposite sides of the bins, said storehouses being shown as provided with very steeppitched roofs.

13 indicates a boiler, and 14 a steam-pipe leading therefrom to the steam-chest 15 of a cylinder 16 of an engine provided with the usual main shaft 17, carrying a belt-pulley18, from which leads a belt 19 to a line-shaft 20, carrying a belt-pulley connected by a belt 21 to a pulley 22, a second line-shaft 23, carrying a belt-pulley connected by a belt 24 with a shaft 25, carryinga bevel gear-wheel 26. (See Figs. 4 and 5.) The bevel gear-wheel 26 meshes with a similar gear-wheel 27 on shaft 28, which also carries a gear-wheel 29, and a belt-pulley carrying a belt 30, connecting with a pulley 31 on one of a pair of rolls 32, journaled in the discharge-opening of a funnel-shaped hopper 33, on which the natural sand to be processed is fed. The gear-wheel 29 meshes with the gear-teeth 34 on a cylinder 35, mounted in an inclined position on rollers 36 and 37, journaled in bearings supported in brackets or pillow-blocks 38. The cylinder 35 is connected with the hopper discharge-opening below rolls 32 by means of a curved spout 39, lead ing into its elevated end through a smokeboX 40, from which arises a smoke-stack 41. The cylinder 35, rotated by the means described, serves to conduct the sand delivered by rolls 32 to a pit below a furnace 42 and at the same time serves as a flue to conduct the heat and products of combustion from the oven, these products ascending the cylinder while the sand is rolling down the cylinder, thereby exposing every particle of the sand to the heat and destroying and consuming all vegetable matter, clay, loam, and other foreign substances.

From the pit under the furnace 42 (see particularly Fig. 2) the sand is carried up by an elevator 43, running in a case 44, and delivered into a spout 45, by means of which it can be dropped into either of the bins 8 or 9, so

that one of them may be filling while the other is being emptied, the sand being cooled as it drops into these bins. Each of these bins 8 and 9 has a sliding door at the bottom, as at 46 .47, leading into the elevator-way between the bins, said doors being raised when desired by means of cords 4:8 49, leading over pulleys to within the reach of the operator. The sand when permitted by the opening of the doors passes out of the bin upon boards 51 and through an opening between them, being assisted in its passage by a toothed roll 52 in the opening, mounted upon a shaft 53. From this opening the sand drops on and is passed between a pair of rolls 54, journaled in a hopper 54, and dropped upon a screen 55, (of well-known construction,) by which it is separated from all gravel, &c., remaining on it and screened into different grades, which drop into a suitable receptacle, as at 56. From this receptacle the sand is taken up by elevators, as at 57 58, and delivered into bins (not shown) in storehouses l1 and 12, where it may be moistened in any well-known manner ready for delivery. For some purposes it is desirable to load the sand direct from the elevators upon the cars, which may be done through spouts 59, into which the sand may be delivered by means of trap-doors, as at 60, operated by cords at 61, leading down to within reach of the operator. The line-shaft 23 drives the elevators 57 and 58 through belt 65. One or more shafts 67 are journaled transversely across the receptacle 56 and are driven from the shaft 53 by means of the belt 66. Each of the shafts 67 is provided with a cam or eccentric 67', by means of which the screen is supported and agitated in the wellknown manner for supporting screens.

In Figs. 6, 7, 8, and 9 I illustrate a veryimportant adjunct to the machinery hereinbefore described, which addition consists of a sieve or screen mounted over the feed-hopper and provided with means for breaking up lumpy sand and eliminating stones and other objectionable matter from the sand before it is fed into the drier. In these figures it will be observed that a shaft 77 projects from the wall of the building, being driven by a belt from the machinery heretofore described, upon which shaft are secured tappets 68, (one or more, as may be necessary,) which in their revolution strike under, raise, and drop a pin 69 and an upright 70, to which the pin is secured. The upright carries at its lower end an inclined crusher plate or board 71, having its upper end curved upward, as at 72. The shaft 77 has its outer end bearing in an upright 73, to which is also secured an inclined sieve or screen 73 and supported at its upper end by uprights 74, said sieve having side and end boards 75 76 and resting over the hopper 33, with the lower edge of the screen projected over the edge of the hopper.

The rough sand is fed into the screen above the crusher, and as the crusher is reciprocated or knocked vertically the sand passes down the screen,the curved upperendof the crusher facilitating the passage under the crusher of all lumps too large to drop through the meshes of the screen. Such lumps are substantially broken up by the crusher and made to pass through the screen into hopper 33; but such as are too large and unbreakable will be dropped off the lower end of the screen upon the ground, all good sand dropping through into the hopper.

From the foregoing it will be seen that the green sand passes through the following steps, viz: first, screened and crushed in the sieve and crusher, next crushed by rolls 32, next tumbled and carried down the cylinder 35 while subjected to the reverse or ascending current of heat from the furnace, whereby all moisture is evaporated and all combustible foreign matter consumed, next carried up to the bins and cooled, next dropped upon the second pair of crushing-rolls, next screened from all foreign matter and graded, next, and finally, carried up and dropped into bins in the storehouses and moistened. The result of this treatment is pure and standard-grade sand freed from all vegetable or organic matter, gravel, &c., which will be stronger and more lasting than green sand and give a more uniform and safer vent through the mold, assuring greater certainty of the cast. The castings will be smoother, requiring less cutting, washing, scabbing, milling, and cleaning, thereby assuring less loss on account of breaking and chipping during the cleaning operations and less wearing away of the designs on fine castings.

While I have illustrated and described what I consider to be the best means now known to me for carrying out my invention, I do not wish to be understood as restricting myself to the exact forms and constructions shown, as many slight changes therein or variations therefrom might suggest themselves to the ordinary mechanic, all of which would be clearly included within the limit and scope of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. The combination with a building comprising a central portion, a store-room upon each side thereof, and a shed, of a furnace in the shed, a pit under the furnace, a conveyor leading thereto and an elevator leading therefrom to the top of the central portion, a grader below the central portion, and an elevator leading from below the grader to each of the store-rooms.

2. The combination with a building comprising a central portion, a store-room upon each side thereof, and a shed, the upper part of the central portion containing two bins and an elevator-way, and the lower portion containing a grader, of a furnace and a pit in the shed, a conveyer leading to the furnace, an elevator leading from the pit to the top of the central portion and communicating with the bins, and an elevator leading from below the grader to each of the store-rooms, one of them being adapted to communicate with the exterior of the building, substantially as described.

estate 8. The combination with a'building comprising a central portion, astore-room on each side thereof, and a shed, the central portion being provided with bins, of afurnace in the shed, a grader below the bins, a feed-roller and two crushing-rolls between the bins and the grader, an elevator leading from below the grader to each of the store-rooms, and an elevator leading from the shed to the bins in the central portion,substantially as described.

lhe combination with a furnace, of a smokebox connecting therewith, a feed-hopper above the smoke-box, a conduit leading therefrom to the furnace, an inclined screen above the hopper and a vertically-movable crusher above the screen, the forward end of which is curved upwardly, substantially as described.

5. The combination of a furnace, an inclined revolving cylinder leading therefrom and carrying an upward current of heat, a feed-hopper, a spout leading therefrom into the upper end of the cylinder, a screen mounted above the hopper, a crusher in the screen, and means for raising and dropping the crusher, substantially as described.

6. The combination with a furnace of a smoke-box, a smoke-stack leading therefrom, a hopper, an inclined revolving cylinder lead ing from the furnace to the smoke-box, a spout leading from the hopper through the smoke-box into the raised end of the cylinder; a receptacle below the furnace into which the lower end of said cylinder empties, and an elevator for removing the deposits therefrom, substantially as described.

7. In a machine for treating sand, the cornbination with a furnace and feed-hopper of an inclined revolving cylinder leading from the hopper and carrying an upward current of heat from the furnace, a pit to receive sand from the cylinder, cooling-bins, an elevator to carry the sand up into said bins, rolls below the bins, a screen below the rolls, a receptacle into which the sand is discharged from the screen, and means for conveying the sand to the storehouses, substantially as described.

JOHN A. BOUGHTON,

Witnesses:-

WILLIAM P. FAYERWEATHER. HATTIE BOUGHTON. 

